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From: Sven Eckelmann <sven@narfation.org>
Date: Fri, 14 May 2021 19:34:35 +0200
Subject: batman-adv: Fix build of multicast code against Linux < 5.13
Fixes: 007b4c4b031f ("batman-adv: convert ifmcaddr6 to RCU")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -422,9 +422,14 @@ batadv_mcast_mla_softif_get_ipv6(struct
return 0;
}
+#if LINUX_VERSION_IS_LESS(5, 13, 0)
+ read_lock_bh(&in6_dev->lock);
+ for (pmc6 = in6_dev->mc_list; pmc6; pmc6 = pmc6->next) {
+#else
for (pmc6 = rcu_dereference(in6_dev->mc_list);
pmc6;
pmc6 = rcu_dereference(pmc6->next)) {
+#endif
if (IPV6_ADDR_MC_SCOPE(&pmc6->mca_addr) <
IPV6_ADDR_SCOPE_LINKLOCAL)
continue;
@@ -453,6 +458,9 @@ batadv_mcast_mla_softif_get_ipv6(struct
hlist_add_head(&new->list, mcast_list);
ret++;
}
+#if LINUX_VERSION_IS_LESS(5, 13, 0)
+ read_unlock_bh(&in6_dev->lock);
+#endif
rcu_read_unlock();
return ret;
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